Coverity scan reported new defects related to Roxie

 *** CID 1511046:  Null pointer dereferences  (FORWARD_NULL)
/home/vamosax/build/CE/platform/HPCC-Platform/roxie/udplib/udptrs.cpp: 513 in UdpReceiverEntry::sendData(const UdpPermitToSendMsg &, TokenBucket *)()
507                 if (isLocal && (totalSent> 100000))  // Avoids sending too fast to local node, for reasons lost in the mists of time
508                     break;
509     #endif
510             }
511             MemoryBuffer encryptBuffer;
512             if (udpTraceFlow)
>>>     CID 1511046:  Null pointer dereferences  (FORWARD_NULL)
>>>     Passing null pointer "this->resendList" to "numActive", which dereferences it.
513                 DBGLOG("Sending %u packets [..%u] from max of %u [resend %u queued %u]", (unsigned)toSend.size(), nextSendSequence.load(), permit.max_data, resendList->numActive(), packetsQueued.load(std::memory_order_relaxed));
514             sendStart(toSend.size());
515             for (DataBuffer *buffer: toSend)
516             {
517                 UdpPacketHeader *header = (UdpPacketHeader*) buffer->data;
518                 unsigned length = header->length;